.preloader {
    position: fixed;
    text-align: center;
    z-index: 99999;
    width: 100%;
    height: 100vh;
    background-color: #2222226e;
    display: grid;
    align-content: center;
    justify-content: center;
    color: #FFF;
}
.loader {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: block;
  margin:15px auto;
  position: relative;
  color: #FFF;
  box-sizing: border-box;
  animation: animloader 1s linear infinite alternate;
}

@keyframes animloader {
  0% {
    box-shadow: -38px -12px ,  -14px 0,  14px 0, 38px 0;
  }
  33% {
    box-shadow: -38px 0px, -14px -12px,  14px 0, 38px 0;
  }
  66% {
    box-shadow: -38px 0px , -14px 0, 14px -12px, 38px 0;
  }
  100% {
    box-shadow: -38px 0 , -14px 0, 14px 0 , 38px -12px;
  }
}